Hi everyone. My troubles began here: https://answers.microsoft.com/en-us/windows/forum/windows\_11-performance/disk-performance-100/ae52a97b-01a8-4452-95d8-e96e85596349?messageId=369f284d-8546-4cf4-8988-2bc1acfd2d93
After that, I did a clean installation of Windows 11 (it turned out to be much easier than I thought). I started a new profile, and I did not recover any files.
After that:
- Gigabyte App offered me to update different drivers. I agreed.
- I installed all updates offered by Windows
- I installed Steam and started to download some games
I did not download any other apps. The download and installation speed was around 100 MB/s. During downloading of one of the games, I noticed that the download speed became zero. I thought that my connection was interrupted, but it was not. Then I saw that my disk performance was 100%, mostly used by Steam and the system. Then the blue screen appeared with "SYSTEM SERVICE EXCEPTION". I waited for about an hour, but nothing happened. Then I just restarted my PC.
Now I see this screen, and I am not sure what to do next.
I will be most grateful for your comments and assistance.

